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In my '09 C4S I can hear a rhythmic "click-click" sound that seems to be coming from right behind the driver's seat near the rear wheel well. I can hear it at idle or at highway speed. It is about every 1 1/2 to 2 seconds in frequency and always two clicks. It sounds like an electrical relay or solenoid activating and then deactivating. I thought that maybe it is a fuel pump coming on and off. Does anyone know what this "Click-Click" might be?

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I often use my i-phone to listen to music through the "Aux" connection in my C4S. Yesterday while driving I realized that the "Click Click" I was hearing was coming from the the car's sound system when the system was set to use "Aux" as the music source. I can turn the volume louder and the "Click Click" gets louder. If I turn the volume off the "Click Click" goes away.